Thanks, pete. I think the noise is coming from else where
on my car. I took apart the GFB just in case and re-lubed it.

The pssshh sound is as good as new.

Edit: btw, for those that don't have this unit yet who
want to know, re-lubing the GFB is very easy. . you don't
even have to take the bov off the car.

There are 4 hex screws on the top of the hybrid GFB.
Take the 4 hex screws off while holding the top of the bov.
Slowly pull off the top of the bov...there is a spring holder
spacer and a long spring inside. Take those out.
You will see a bronze colored sleeve (piston) inside the bov.
Pull that out, clean it off and the inside of the bov.
Re-grease the piston. Push the piston back in, move it
around with your fingers a little to disperse the grease.